Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add suryast/free-ai-agent-skills --skill cron-doctorgit clone --depth 1 https://github.com/suryast/free-ai-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/suryast/free-ai-agent-skills/cron-doctor)<a href="https://agentmods.dev/skills/suryast/free-ai-agent-skills/cron-doctor"><img src="https://agentmods.dev/badge/skills/suryast/free-ai-agent-skills/cron-doctor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/suryast/free-ai-agent-skills/cron-doctor"><img src="https://agentmods.dev/badge/skills/suryast/free-ai-agent-skills/cron-doctor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00056 | $0.00869 |
| Opus 5 | $0.00028 | $0.00434 |
| Sonnet 5 | $0.00011 | $0.00174 |
| Haiku 4.5 | $0.00006 | $0.00087 |
Grade B, and why
cron-doctor scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo cat /etc/crontab How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compatible with Claude Code, Codex CLI, Cursor, Windsurf, and any SKILL.md-compatible agent.
Cron Doctor
Diagnose and triage cron job failures.
Usage
When asked to check cron health or diagnose failures:
1. List All Jobs
# List user's crontab
crontab -l
# List system crontabs
sudo cat /etc/crontab
ls -la /etc/cron.d/
2. Check Recent Execution
# Check cron logs (location varies by system)
# Debian/Ubuntu:
grep CRON /var/log/syslog | tail -50
# RHEL/CentOS:
tail -50 /var/log/cron
# macOS:
log show --predicate 'process == "cron"' --last 1h
# Check for specific job output
grep "your_job_name" /var/log/syslog | tail -20
3. Identify Problems
Error patterns to watch:
"command not found"— Missing executable or PATH issue"Permission denied"— File/directory permissions wrong"No such file or directory"— Script path incorrect"timeout"— Job took too long"ECONNREFUSED"— Network/service down"rate limit"— API throttling- Missing output — Job may not be running at all
4. Triage Priority
| Priority | Criteria |
|---|---|
| 🔴 Critical | Trading, backup, security jobs |
| 🟠 High | User-facing deliveries |
| 🟡 Medium | Monitoring, research jobs |
| 🟢 Low | Nice-to-have, non-essential |
5. Generate Report
Write to ~/reports/cron-health-YYYY-MM-DD.md:
# Cron Health Report - [DATE]
## Summary
- ✅ Healthy: X jobs
- ⚠️ Warning: X jobs
- ❌ Failed: X jobs
## Failed Jobs
### [Job Name]
- **Error:** [message]
- **Last Success:** [date]
- **Priority:** [level]
- **Fix:** [suggested action]
## Recommendations
1. [Action item]
2. [Action item]
6. Common Fixes
| Error | Fix |
|---|---|
| Command not found | Use full path to executable, or set PATH in crontab |
| Permission denied | Check file permissions, run chmod +x script.sh |
| No output | Add >> /tmp/job.log 2>&1 to capture output |
| Wrong timezone | Set TZ= in crontab or use system timezone |
| Rate limit | Reduce frequency or add backoff |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 134 lines · 56 tokens per session scan B cf96c843232a
cron-doctor is a skill published in the GitHub repository suryast/free-ai-agent-skills (2 stars, last pushed 2d ago), licensed MIT. It adds 56 tokens to every session and 869 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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